Dialing tool



June 24, 1941. J. J.-KUHN EI'AL 2,247,027

I DIALING TOOL 2 Filed Dec. 20, 1938 J. J. KUHN //Vl/EN TORS. W 7 PR/TCHARD A. R. SAUNDERS Patented June 24, 194

DIALING TOOL 161m J. Kuhn, Elizabeth, and William T. W Pritchard, 'Belvidere, N. J., and Arthur It. Saunders, Rosebank, N. Y., assignors to Bell Telephone Laboratories, Incorporated,

New

York, N. Y., a corporation of New York Application December 20, 1938, Serial No. 246,798

4 Claims.

This invention relates to dialing tools used for actuating telephone call transmitters of the flnget-wheel operated type. 1

The object of the invention is to improve the construction and operation of such dialing tools and decrease their noise level when brought into contact with the finger-holds of the transmitter Fig. 5 is a cross-sectional view taken on line 5-5 of Fig. 4. v

In the dialing tool of the invention the metallic sleeve l which may form apart of any'wellknown mechanical lead propelling mechanism isv provided with a shoulder or equivalent abutting portion ll resting on a metallic washer l2, in turn abutting against the end of the pencil handle H which may be made of a non-metallic material.

In the sleeve I0 is inserted a plug member l3 made preferably of a relatively soft metallic material such as aluminum. This. plug extends a comparatively short distance below the top end of the pencil handle H for reenforcing the sleeve i0 at this point. ,The plug l 3 is provided with a substantially ,V-shaped groove l4 into which the sleeve in is crimped for preventing relative movement'between this plug and the sleeve Ill.

The plug i3 is provided with a longitudinal centrally disposed hole l5 for receiving a screw l6 having a collar'portion X to serve as pivot 'engaging one of the polar openings in a, sphericallyshaped shell ll. The other polar opening, as shown inFig. 2, is fitted with a bearing in the form of-a ring 18 of substantially V cross-section rotatably engaging the sleeve it! which thus serves as a second pivot-forthe shell, the shell ll being provided with a recess I9 for receiving the head of the pivot screw I6, while a washer 20', disposed between the shell I1 and the aluminum plug l3 servesas an end-thrust bearing therebetween.

The shell ll is provided with a plurality of equally spaced slots SL which, when the shell is inserted in one of the finger-holds FH, for example; in the transmitter finger-wheel FW,- extend substantially at equal distances from the point of contact of the shell with the edge of the finger-holds in the finger-wheel FW as shown in Fig. 3, the slots SL being provided to prevent the vibration of the shell when brought into contact with the finger-holds so as to reduce its noise level, while the shoulder. portion ll formed with the sleeve I0 prevents the longitudinal movement of the sleeve into the handle H of the pencil and the consequent forcing of the ring or bearing iii of the shell ll into contact with the washer I! thus assuring free rotation of the shell on its pivots.

In the modification shown in Figs. 4 and 5, the sleeve ill and the plug iii are provided with two diametrically disposed parallel slots 20, 2| and 2QY, 2|Y, which may be cut in the sleeve i0 and the plug l3 after the crimping operation of the sleeve into the V-shaped recess it of the plug. A cup-shaped ring 22 abuts against the top end of the pencil handle H as shown in Fig. 4 and the .prongs 23 and 24 of an -open ring OR engage the slots 20--2l and 20Y-2 IY of the sleeve Ill and the plug iii, the ring OR being afterward inserted into the cup-shaped ring 22 which thus holds this ring in engaged relation in the diametrically disposed slots 20-2! and 2llY-2 IY of sleeve l0 and plug l3.

The construction of the modification above described efiectively prevents the movement of the sleeve relative to the pencil handle H when the spherically-shaped shell ll is brought in engagement with the finger-wheel holds and thereby prevents the shell being forced against the rim of ring. 22 which would prevent the free rotation of the shell ll on its pivots.

It is understood that minor changes may be made to the dial'tool of the invention without departing from the scope of the appended claims.

What is claimed is:

1. In a dialing tool, a handle having a sleeve extending from one end thereof, a sphericallyshaped shell having two polar openings, one of the openings engaging said sleeve. a plug fitted in said sleeve, and means secured to said plug and engaging the second opening .to serve as a second pivot for said shell.

2. In a dialing tool, a handle having a sleeve extending from one end thereof, a sphericallyshaped shell having two polar openings and a re-' against said handle, means carried by said sleeve cooperating with said ring for holding the sleeve against movement relative to said handleupon a force applied thereto, a. spherically-shaped shell having two polar openings forming bearings, one of said bearings rotatably engaging said sleeve and means carried by said sleeve rotatably engaged by the otherbearing.

4. In a dialing tool, a spherically-shaped shell having two polar openings and a recess concentric to the upper opening, a spindle for said shell having a reduced portion and a shoulder portion, the reduced portion engaging the polar opening concentric to the recess, said reduced portion having a head within the recess for cooperation with said shoulder portion for holding said shell against movement longitudinally on said spindle, said spindle being formed with a portion for engaging a handle..

JOHN J. KUHN.

WILLIAM T. PRITCHARD.

ARTHUR R. SAUNDERS. 

